JSFiddle - React, Tailwind, and code Playground

JavaScript

var anterior = 0,
	ultimo   = 1,
	aux, auxa = 0, i = 1,
	pi = Math.PI,
	picalc = 0;

while( pi != picalc ){
	aux = anterior+ultimo;
	anterior = ultimo;
	ultimo = aux;
	if( i % 2 == 0 ){
		return;
	}
	auxa += Math.atan( 1 / ultimo );
	picalc = 4*auxa;
	i++;
	console.log(picalc);
}